Wireless time-signaling.



' a. BELIN.

WIRELESS TIME SIGNALING. APPUCAHON HLED OCT. 24. IBM.

Patented Mar. 26, 1918 2 SHEETS SHEETI IlwfllllllilllllilllllllIW E. BELIN. wanmss we SIGNALING. APPLICATION FILED OCT. 24. l9

Patented Mar. 26, 1918.

Z SHEETS-SHEET 2.

UNITED STATES PATENT OFFICE.

EDOUABD DELHI, 01 PARIS, FRANCE.

WIRELESS TIME-SIGNALING.

Specification. of Letters Intent.

Patented Mar. 26, 1918.

Application filed October 24, 1814. um1xo.m,m.

'the following is a specification.

The present invention relates to an arrangement for bringing apparatus situated at one or more stations m synchronism with that of a main station by either telegraph or wireless telegraph It is necessary that these apparatus should keep absolutely in step, should run at the same speed and should pass through the same initial point simultaneously. These apparatus may perform a number of different functions, for example that of synchronous clocks, or of transmitting and receiving drums for electrical signals whether luminous or otherwise, the transmitting and reception of teleraphic messages, photographs and the hire. lach of the stations may be furnished with a similar member having an exact periodic movement such as those of clocks and chr0- nometers, the im ortant feature being the time of the peri ic movement.

It will be understood that the accuracy of the construction depends on counting upon an absolute isochronism between the two moving members, but these will hardly ever be in synchronism, that is tosay have a,

simultaneous passage through a fixed point.

According to the present invention the arrangement for bringing the elements of one or more substations having similar periodic movements into synchromsm with that of the main station comprises apparatus at each station for correcting each of said elements after intervals of predetermined extent, an' auxiliary apparatus being provided at each substation consisting of an element having a similar periodic movement to the elements to be synchronized and a member the position of which may be adjusted so as to'coiiperate at any desired moment with i said auxiliary element, whereby a corrective movement may be imparted to each of the substation elements simultaneously with the correction of the main station element by its apparatus.

,Various methods of solving. this problem of doublecoincidence can be ruddy rcoivod. An arrangement will be described which is more particularly applicable to the case of Synchronizing two rotating drums by wireless telegraphy. It will be understood that more than one drum may be controlled, that is to say that it is possible to control a number of stations by the emitting of waves from a single station, it being understood of course that all these stations are capable of detecting the waves transmitted from this station.

The invention will be better understood by referring to the accompanying drawings, in which:

' Figure 1 shows diagrammatic representation of the apparatus and electrical connections, while Fig. 1" is a view similar to Fig. 1 of the ap aratus located at the receiving station, an

Fig. 2 shows a sectional view of the auxiliary adjusting apparatus.

the regulating station A a clock or chronometer 1 riodically closes a contact in the circuit 0 the battery 2. This circuit passes into the relay 20 so as, to cause the emission of waves by wireless telegraphy by means of the wires 3 and forms the regulating signal; at the same time this current passes through the electro-magnet 4 attract- III the armature 5 which on being displaced re eases a stop 6 on the main drum 7 which in turn is driven b a motor through the friction clutch 8 an runs at a speed rather greater than that corresponding to the eriod of the chronometer 1 Therefore 1ctween two consecutive closings of the circuit by the chronometer the drum 7 makes one turn.

At the receiving station, see Fig. 1, a chronometer or clock 1' is provided which is identical and isochronous with the chr0- nometer I of station A. Its operation is also similar to that of the station A in that it releases at similar intervals by means of the electro-magnet 4, its armature 5' and stop 6, a drum 7' driven by a motor throu h the friction clutch 8.. This is not the driving drum. The drum 7' must control, and

strikes a ainst a contact 10 closing the circuit of t e battery 2" through the electromagnet 4". In parallel with this circuit 18 arranged the receiver E in such manner that the closing of the contact can be detected. By listening it is then possible to hear both the signal emitted by the main battery 2 and the signal by the controlling battery 2. This in practice will hardly ever be in coincidence. All. that is necessary then is to move the contact 10 by displacing it, for example manually by means of the screw 11 and the wheel 12 around the axis of rotation of the drum 7 in such manner as to obtain an exact coincidence. At this moment the synochronism of the drum 7 will be identical with the drum 7 which were formerly only in isochronism. The synchronism will therefore remain as long as isochronism exists between the two chronomstars or the clocks 1 and 1.

In Fig. 2 is shown a section showing the method of operation of the parts 7', 8, 9, 10, Hand 12. A support 13 carries the shaft 14 of the drum 7 driven by means of the screw or pinion 15 through the friction clutch 8'. This shaft 14 is provided at its other end with a disk 16 in which is embedded the contact 9 shown here in the form of a, ball spring pressed outwardly. The shaft 14 serves as an axis and as a sup art to the hollow shaft 17 of the wheel '12 w ic-lr carries the contact 10. It is possible to displace by hand the wheel 12 by means of the screw 11 and consequently regulate the instunt at which contact is made between 9 and 10. The electric circuit is connected on one hand to the shaft 14 and on the other hand to the wheel 12. It will be understood that it will never be necessary to regulate the-coincidence of the signals detected in the receiver E for a duration greater than that of a half period of the clock, because the wheel 12 can turn in either one direction or the other and consequently this regulation'can be made very accurately in a very short time; As has been said at the commencement,

the drums 7 and 7" can be 'emplo ed for very different purposes and may )e connected either by wire or without which in itself is independent of the solution of the synchronizing problem, for example the exact time ma .be received by means of a series of suita le rotations occurring once every second. The signals transmitted b the-one may be received by the other wit great accuracy. Also synchronism may be obtained for example forthe transmission of messages, photographs or the like by wireless or hnetelegraphy, the synchronism in these latter cases being regularly regulated in a simple manner during the transmission of the other emissions.

Having now particularly described and ascertained the nature of my invention, I declare that what I claim is:

1. An arrangement for bringing elements at one or more substations havin similar periodic movements into synchronlsm with that of the main station, comprising apparatus at each station for correcting each of said elements after intervals of predetermined extent, an auxiliary apparatus being proyided at eachsubstation consisting of an element having a similar periodic movement to the elements to be synchronized, and a member the position of which may be adjusted so as to coiiperate at any desired moment with said auxiliary element, whereby a corrective movement may be imparted to each of the substation elements simultaneously with the correction of the main station element by said apparatus.

2. An arrangement for synchronizing apparatus having similar periodic movements and situated at one or more substations with that of a. main station, comprising members having isochronous movements, provided at each of the stations, of which that of the main station corrects its own apparatus and transmits an electric signal simultaneously after uniform intervals while that at the substation regulates its own apparatus through an auxiliary member having a similar movement and an adjustable member coacting therewith, a detector being provided to note both the time of receipt of the electric signal and the time of correction of the sub-station apparatus,- thus enabling, by adjustment of the memberco-acting with the auxiliary apparatus, the two corrections to be brought into exact coincidence, substantially as described.

8. An arrangement for bringing elements at one or more substations havin s' r periodic movements into synchromsm with that of the main station, comprising ap aratus at each station for correcting of said elements after intervals of predetermined extent, an auxiliary apparatus being provided at each substation consisting of an element having a. similar periodic movement to the element to be s chronized, and electro-magnetic means a opted to correct the motion of boththe main and auxiliary appafius aforesaid. f

arrangement or synchrommng' a paratps having similar periodiemovemenz and situated at one or more substations with Ill that. of a main station, comprising members auxiliary ap aratus,

to note both the time of receipt of'the clectrio signal and the time of correction of the sub-station apparatus, thus enabling, b odjustment of the member co-acting wit the the two corrections to be brought into exact coincidence, substantiallyas described and a telephone receiver adapted to be a acted both by the transmitted signal and the correcting current of the main station apparatus.

5. An arrangement for bringhig elements at one or more substations having similar periodic movements into synchronism with that of the main station, comprising apparatus at each station for correcting each of said elements after intervals of predetermined extent, an auxiliary apparatus being provided at each substation consisting of anelement having a similar periodic movement to the elements to be synchronized, and a member the position of which may be adjusted so as to cooperate at any desired moment with said auxiliary element, whereby a corrective movement may be imparted to each of the substation elements simultaneously with the correction of the main station element by said apparatus, the said auxiliary apparatus comprising a member rotatable at a speed corresponding tothat of the mails apparatus and provided with a. contact adapted to close the circuit of the correcting a paratus.

6. n arrangement for bringing at one or more substations havin similar periodic movements into synchronism with that of the main station, comprising apparatus at each station for correcting each of said elements after intervals of predetermined extent, an auxiliary apparatus brain? provided at each substation consisting 0 an element having a similar periodic movement to the elements to be synchronized, and a member the position of which may be adjusted so as to cooperate at any desired moment with said auxiliary element, whereby a corrective movement may be im arted to each of the substation elements simultaneously with the correction of the main station element by said apparatus, and wireless telegraphic means whereby the main station may si al to the substations.

In witness whereof I have hereunto si ed my name in the presence of two subscri ing witnesses, this sixth day of October 1914.

EDOUABD BELIN.

Witnesses:

G. F. Wmm, Dz Wrrr 0. Poem, Jr.

elements 

